The roller uses the combinated structure, the speed difference and
the forming resistance are small, the steel plate surface will be
less wear; and also guaranteed the precision shape of the working
piece with no scratch .The material of the roller is the GCr15
forging, after whole quenching then by numerical control
processing, degree of hardness can reach HRC58-62; Has the
characteristic with high strength, hardness, precision and long
service life etc.